forked from bartvdbraak/blender
112 lines
2.4 KiB
C++
112 lines
2.4 KiB
C++
/*
|
|
* $Id$
|
|
*
|
|
* ***** BEGIN LGPL LICENSE BLOCK *****
|
|
*
|
|
* Copyright 2009 Jörg Hermann Müller
|
|
*
|
|
* This file is part of AudaSpace.
|
|
*
|
|
* AudaSpace is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* AudaSpace is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* ***** END LGPL LICENSE BLOCK *****
|
|
*/
|
|
|
|
#include "AUD_ReverseReader.h"
|
|
#include "AUD_Buffer.h"
|
|
|
|
#include <cstring>
|
|
|
|
AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) :
|
|
AUD_EffectReader(reader)
|
|
{
|
|
if(reader->getType() != AUD_TYPE_BUFFER)
|
|
AUD_THROW(AUD_ERROR_READER);
|
|
|
|
m_length = reader->getLength();
|
|
if(m_length < 0)
|
|
AUD_THROW(AUD_ERROR_READER);
|
|
|
|
m_position = 0;
|
|
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
|
|
}
|
|
|
|
AUD_ReverseReader::~AUD_ReverseReader()
|
|
{
|
|
delete m_buffer; AUD_DELETE("buffer")
|
|
}
|
|
|
|
void AUD_ReverseReader::seek(int position)
|
|
{
|
|
m_position = position;
|
|
}
|
|
|
|
int AUD_ReverseReader::getLength()
|
|
{
|
|
return m_length;
|
|
}
|
|
|
|
int AUD_ReverseReader::getPosition()
|
|
{
|
|
return m_position;
|
|
}
|
|
|
|
void AUD_ReverseReader::read(int & length, sample_t* & buffer)
|
|
{
|
|
// first correct the length
|
|
if(m_position+length > m_length)
|
|
length = m_length-m_position;
|
|
|
|
if(length <= 0)
|
|
{
|
|
length = 0;
|
|
return;
|
|
}
|
|
|
|
int samplesize = AUD_SAMPLE_SIZE(getSpecs());
|
|
|
|
// resize buffer if needed
|
|
if(m_buffer->getSize() < length * samplesize)
|
|
m_buffer->resize(length * samplesize);
|
|
|
|
buffer = m_buffer->getBuffer();
|
|
|
|
sample_t* buf;
|
|
int len = length;
|
|
|
|
// read from reader
|
|
m_reader->seek(m_length-m_position-len);
|
|
m_reader->read(len, buf);
|
|
|
|
// set null if reader didn't give enough data
|
|
if(len < length)
|
|
{
|
|
if(getSpecs().format == AUD_FORMAT_U8)
|
|
memset(buffer, 0x80, (length-len)*samplesize);
|
|
else
|
|
memset(buffer, 0, (length-len)*samplesize);
|
|
buffer += length-len;
|
|
}
|
|
|
|
// copy the samples reverted
|
|
for(int i = 0; i < len; i++)
|
|
memcpy(buffer + i * samplesize,
|
|
buf + (len - 1 - i) * samplesize,
|
|
samplesize);
|
|
|
|
m_position += length;
|
|
|
|
buffer = m_buffer->getBuffer();
|
|
}
|